package String.StringBuilderDemo;

public class 数组变成字符串 {
    public static void main(String[] args) {
        int[] arr={1,2,3};
        System.out.println(arrToString(arr));
    }
    public static String arrToString(int[] arr){
        StringBuilder sb=new StringBuilder();
        sb.append("[");

        for (int i = 0; i < arr.length; i++) {
            if(i==arr.length-1){
                sb.append(arr[i]);
            }else{
                sb.append(arr[i]+", ");
            }
        }
        sb.append("]");
        return sb.toString();
    }


}
